CN107882543A - A kind of horizontal well horizontal-jet fracturing device - Google Patents
A kind of horizontal well horizontal-jet fracturing device Download PDFInfo
- Publication number
- CN107882543A CN107882543A CN201610875906.7A CN201610875906A CN107882543A CN 107882543 A CN107882543 A CN 107882543A CN 201610875906 A CN201610875906 A CN 201610875906A CN 107882543 A CN107882543 A CN 107882543A
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- horizontal
- eccentric
- bearing
- jet body
- central tube
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- 229920001971 elastomer Polymers 0.000 claims description 4
- 239000005060 rubber Substances 0.000 claims description 4
- 239000003245 coal Substances 0.000 abstract description 9
- 238000002347 injection Methods 0.000 abstract description 8
- 239000007924 injection Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000009471 action Effects 0.000 abstract description 4
- 238000005422 blasting Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 5
- 239000007921 spray Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Nozzles (AREA)
Abstract
The invention discloses a kind of horizontal well horizontal-jet fracturing device, belong to coal-bed gas exploitation field.The device includes eccentric jet body；The eccentric jet body include cavity and positioned at the cavity radial symmetric both sides at least two nozzles, the cavity connects with the nozzle；The central axis of the nozzle is located on the horizontal plane where the central axis of the cavity；With two joints positioned at the both ends of the eccentric jet body；The joint includes central tube and the bearing between the joint and the central tube, and the central tube is fixed with the eccentric jet body and connected；The bearing can be such that the central tube is rotated in the joint；Also, the eccentric jet body has the structure of eccentrically mounted weight.The device can independently realize injection orientation in horizontal well, so as to ensure that blasting jet to fixed horizontal direction injection, can play good control action, and have good effect to the fracturing reform of coal bed gas horizontal well.
Description
Technical field
The present invention relates to coal-bed gas exploitation field, more particularly to a kind of horizontal well horizontal-jet fracturing device.
Background technology
In oil extraction process, fracturing technique is to ensure the important means of oil gas high yield, is that the current oil well that improves harvests
One of effective measures of rate, it is widely used in oil, oil/gas well stimulation, it has also become transformation Low permeable oil and gas reservoirs and exploitation deep oil-gas reservoir
Main Means.So-called pressure break, exactly cause crack in shaft bottom production layer using high-pressure fluid (fracturing fluid etc.) or extend original split
Line, then filled with proppant (sand or other solid particles), to form the process of high permeability zone.By frac treatment
Oil well afterwards, can obtain that flow conductivity is strong, oil, the gas channel of crack length, finally reach volume increase oil, the effect of gas.
In the prior art, for horizontal well pressure break generally by means of slim-hole hydraulic jet orienting fracturing device, use
When, pre-position that fracturing device is transferred in the horizontal well for needing pressure break, one end of the fracturing device is connected to pressure break
On tubing string, other end sealing, fracturing fluid is pumped into the fracturing device by fracturing unit truck, and pass through the nozzle on fracturing device
Spray, so as to realize the pressure break in coal seam at this.
During the present invention is realized, the inventors discovered that problems with the prior art at least be present：Will be existing
Fracturing device when transferring in horizontal well, due to can not be adjusted to the direction of nozzle, so as to it cannot be guaranteed that the water of nozzle
Flow all the time in the horizontal direction；Further, because some coal seams are relatively thin, if the current of nozzle are not in the horizontal direction, pressure break
Easily cause crack quickly vertically extending, causing crack, (cap rock refers to seal on reservoir through cap rock
Make oil gas therein from the protective layer of upward loss every reservoir), have a strong impact on the effect of fractured horizontal well.
The content of the invention
In order to solve above-mentioned technical problem, the present invention provides one kind being capable of self-orientating horizontal well horizontal-jet pressure break
Device.
Specifically, including following technical scheme：
A kind of horizontal well horizontal-jet fracturing device, including：
Eccentric jet body；The eccentric jet body includes cavity and peace positioned at the inside of the eccentric jet body
In the eccentric jet body and positioned at the cavity radial symmetric both sides at least two nozzles, the cavity
Connected with the nozzle；The central axis of the nozzle is located on the horizontal plane where the central axis of the cavity；With
Two joints positioned at the both ends of the eccentric jet body；The joint is included positioned at the inside of the joint
Central tube and the bearing between the joint and the central tube, the central tube is fixed with the eccentric jet body to be connected
It is logical；The bearing can be such that the central tube is rotated in the joint；
Also, the weight of the bottom of the eccentric jet body is more than the weight on the top of the eccentric jet body.
Preferably, the quantity of the nozzle is four in the eccentric jet body.
Further, equally distributed through hole is provided with the bottom of the eccentric jet body, in the through hole
Fill lead.
Further, the both ends of the through hole of the eccentric jet body are respectively arranged with blocking cap.
Preferably, the quantity for the through hole being arranged in the eccentric jet body is three.
Further, the bearing of the joint includes thrust bearing and alignment bearing.
Further, bearing sheath is provided with the outside of the thrust bearing, is set in the outside of the alignment bearing
There is supporting positive cover, the bearing sheath is fixedly connected with the joint and the supporting positive cover respectively.
Preferably, connection is threadably secured between the bearing sheath and the joint and the supporting positive cover.
Further, it is additionally provided with fixed cover between the bearing sheath and the central tube.
Preferably, one of them in two joints has first for connecting and opening to the outside world with the central tube
Opening portion, first opening portion have internal thread；In two joints another have connected with the central tube and
Second opening portion of opening, second opening portion has external screw thread.
Preferably, it is threaded connection between the central tube of the joint and the eccentric jet body.
Preferably, the horizontal well horizontal-jet fracturing device also includes multiple O-shaped cushion rubbers.
The beneficial effect of technical scheme provided in an embodiment of the present invention：There is provided one kind being capable of self-orientating horizontal well level
Spray fracturing device.Specifically, by the structure for being arranged to eccentrically mounted weight of jet body, the injection of eccentrically mounted weight is made by bearing
The nozzle of main body can be rotated freely, and automatic orientation makes the jet at nozzle be realized close to level angle on horizontal level
The current of nozzle in the horizontal direction, so as to ensure that blasting jet sprays to fixed horizontal direction, avoid coal bed gas in pressure break all the time
Water string occurs afterwards, good control action can be played to the fracturing reform of coal bed gas horizontal well, and there is good effect.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is a kind of structure chart of horizontal well horizontal-jet fracturing device provided in an embodiment of the present invention；
Fig. 2 is sectional views of the Fig. 1 along A-A directions.
Reference in figure represents respectively：
1st, eccentric jet body；1a, bottom；1b, top；
2nd, joint；
3rd, cavity；
4th, nozzle；
5th, central tube；
6th, bearing；6a, thrust bearing；6b, alignment bearing；
7th, through hole；
8th, bearing sheath；
9th, supporting positive cover；
10th, fixed cover；
11st, the first opening portion；
12nd, the second opening portion；
13rd, O-shaped cushion rubber；
14th, blocking cap；
15th, apical ring.
Embodiment
To make technical scheme and advantage clearer, embodiment of the present invention is made below in conjunction with accompanying drawing into
One step it is described in detail.Unless otherwise defined, all technical terms used in the embodiment of the present invention are respectively provided with and art technology
The identical implication that personnel are generally understood that.
The present invention provides a kind of horizontal well horizontal-jet fracturing device, and as shown in Figure 1-2, Fig. 1 carries for the embodiment of the present invention
A kind of structure chart of the horizontal well horizontal-jet fracturing device supplied；Fig. 2 is sectional views of the Fig. 1 along A-A directions.The horizontal well is horizontal
Injection fracturing device includes：
Eccentric jet body 1；Eccentric jet body 1 includes being located at the cavity 3 of the inside of eccentric jet body 1 and is arranged on
In eccentric jet body 1 and it is located at least two nozzles 4 of the both sides of the radial symmetric of cavity 3, cavity 3 connects with nozzle 4；
The central axis of nozzle 4 is located on the horizontal plane where the central axis of cavity 3；With
Two joints 2 positioned at the both ends of eccentric jet body 1；Joint 2 includes the central tube 5 positioned at the inside of joint 2
And the bearing 6 between joint 2 and central tube 5, central tube 5 are fixed with eccentric jet body 1 and connected；Bearing 6 can make center
Pipe 5 rotates in joint 2；
Also, the bottom 1a of eccentric jet body 1 weight is more than the top 1b of eccentric jet body 1 weight.
It should be noted that the upper and lower part in the present invention is defined with the working condition of the device, for example,
In real work, the horizontal-jet fracturing device is horizontal positioned in horizontal well, and the bottom 1a of eccentric jet body 1 refers to lead to
The following part of horizontal plane where the central axis of chamber 3, the top 1b of eccentric jet body 1 refer to the central shaft of cavity 3
The part above of horizontal plane where line, as shown in Figure 2, it is preferable that the bottom 1a of eccentric jet body 1 cross-sectional area
More than top 1b cross-sectional area, i.e. bottom 1a size is more than top 1b size.
The operation principle of horizontal well horizontal-jet fracturing device provided in an embodiment of the present invention is：By the horizontal spray of the horizontal well
The free end (opposite end of the one end being connected with eccentric jet body 1) for penetrating one of joint 2 of fracturing device is connected to pressure
Split on tubing string (not shown), the free end (opposite end of the one end being connected with eccentric jet body 1) of another joint 2 is close
Envelope.During operation, pre-position that the device is transferred in horizontal well casing pipe, because the maximum outside diameter of joint 2 is close to level
Section sleeve pipe internal diameter so that eccentric jet body 1 is in vacant state in sleeve pipe, without with casing-contact.Then using pressure
Splitting car fracturing fluid is pumped into the eccentric jet body 1 of the device, fracturing fluid is sprayed by the nozzle 4 of eccentric jet body 1,
And then fracturing formations.Due to the eccentric jet body 1 in the present invention have eccentrically mounted weight structure (i.e. eccentric jet body 1
Bottom 1a weight is more than the top 1b of eccentric jet body 1 weight), and the energy of central tube 5 being connected with eccentric jet body 1
Freely rotated in joint 2, thus eccentric jet body 1 can in the presence of self gravitation by central tube 5 with 6 turns of dynamic bearing
Move and carry out automatic orientation so that the central axis of the nozzle 4 of eccentric jet body 1 is always positioned at the central axis institute of cavity 3
Horizontal plane on, without being influenceed by the orientation of joint 2.Horizontal well horizontal-jet fracturing device provided in an embodiment of the present invention
Injection orientation can be independently realized in horizontal well, the jet at nozzle 4 is realized that the current of nozzle 4 begin close to level angle
Eventually in the horizontal direction, it is right so as to ensure that blasting jet to horizontal direction injection is fixed, avoids coal bed gas that water string occurs after pressure break
The fracturing reform of coal bed gas horizontal well can play good control action, and have good effect.
In above-mentioned horizontal well horizontal-jet fracturing device, nozzle 4 is arranged in eccentric jet body 1, and positioned at logical
On the radial symmetric position of chamber 3, the present invention does not have considered critical to the quantity of nozzle 4, operating personnel can according to being actually needed and
It is fixed, such as can be two, preferably four, six etc., four.
In above-mentioned horizontal well horizontal-jet fracturing device, in order that eccentric jet body 1 has the knot of eccentrically mounted weight
Structure, and ensure that the central axis of nozzle 4 during horizontal positioned eccentric jet body 1 is located on horizontal plane, it may be provided at eccentric injection
There is equally distributed through hole 7 on the bottom 1a of main body 1, and heavy metal, such as lead are filled in through hole 7.
In above-mentioned horizontal well horizontal-jet fracturing device, further, the both ends of the through hole 7 of eccentric jet body 1
Blocking cap 14 is respectively arranged with, prevents the heavy metal in through hole 7 from spilling.
In above-mentioned horizontal well horizontal-jet fracturing device, lead is filled in the through hole 7 in eccentric jet body 1, with
So that the decentralization of eccentric jet body 1, there is no considered critical to the particular number of through hole 7, for example, can be one, two
It is individual, three, four, five etc., it is therefore preferable to three.Through hole 7 is uniformly distributed on the bottom 1a of eccentric jet body 1, with
Ensure that the central axis of nozzle 4 during horizontal positioned eccentric jet body 1 is located on horizontal plane.
In above-mentioned horizontal well horizontal-jet fracturing device, bearing 6 plays fixed center pipe in the rotation process of central tube 5
5 and reduce central tube 5 frictional force effect, that is to say, that when central tube 5 rotates relative to joint 2, bearing 6 can reduce
Coefficient of friction in power transmission process simultaneously keeps the axis center of central tube 5 to fix.Bearing 6 on joint 2 may include thrust shaft
6a and alignment bearing 6b are held, thrust bearing 6a is used to bear axial force when central tube 5 rotates, and alignment bearing 6b is used in bearing
Radial load when heart pipe 5 rotates.
In above-mentioned horizontal well horizontal-jet fracturing device, it is additionally provided between thrust bearing 6a and alignment bearing 6b
Apical ring 15, and supporting positive cover 9 is additionally provided with the outside of alignment bearing 6b, apical ring 15 and supporting positive cover 9 are used to fixing and protecting righting
Bearing 6b；Further, bearing sheath 8 is may be provided with the outside of thrust bearing 6a, bearing sheath 8, which is used for fixed and protection, to be stopped
Thrust bearing 6a；Bearing sheath 8 is fixedly connected with joint 2 and supporting positive cover 9 respectively.
In above-mentioned horizontal well horizontal-jet fracturing device, to the connection side of bearing sheath 8 and joint 2 and supporting positive cover 9
Formula does not have considered critical, can realize being fixedly connected between it, such as can be the modes such as threaded connection, welding, excellent
Selection of land, connection is threadably secured between bearing sheath 8 and joint 2 and supporting positive cover 9.
In above-mentioned horizontal well horizontal-jet fracturing device, it is also provided between bearing sheath 8 and central tube 5 solid
Surely 10 are covered, fixed cover 10 is used for the relative position for fixing thrust bearing 6a and central tube 5, prevents thrust bearing 6a in central tube 5
Upper slip..
In above-mentioned horizontal well horizontal-jet fracturing device, connected for the ease of one end and fracturing string of the device
Connecing, one of them in settable two of which joint 2 has the first opening portion 11 for connecting and opening to the outside world with central tube 5,
The first opening portion 11, which further can be set, has internal thread, for being threadedly coupled with fracturing string；In addition, for the ease of to this
The other end of device is sealed, and another in two joints 2 has connect and open to the outside world with central tube 5 second to open
Oral area 12, the second opening portion 12, which further can be set, has external screw thread, is sealed for being connected with plug.
In above-mentioned horizontal well horizontal-jet fracturing device, the cavity 3 of eccentric jet body 1 has internal thread, joint 2
Central tube 5 and eccentric jet body 1 cavity 3 between for threaded connection.
In above-mentioned horizontal well horizontal-jet fracturing device, in order to preferably make to be connected and sealed between each component,
The horizontal well horizontal-jet fracturing device may also include multiple O-shaped cushion rubbers 13.
Structure of the invention that be arranged to eccentrically mounted weight by jet body, the nozzle of eccentric jet body is enable by bearing
It is enough freely to rotate, and automatic orientation makes the jet at nozzle realize that the current of nozzle begin close to level angle on horizontal level
Eventually in the horizontal direction, it is right so as to ensure that blasting jet to horizontal direction injection is fixed, avoids coal bed gas that water string occurs after pressure break
The fracturing reform of coal bed gas horizontal well can play good control action, and have good effect.
It is described above to be for only for ease of it will be understood by those skilled in the art that technical scheme, not limiting
The present invention.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in this
Within the protection domain of invention.
Claims (8)
1. a kind of horizontal well horizontal-jet fracturing device, it is characterised in that the device includes：
Eccentric jet body (1)；The eccentric jet body (1) is included positioned at the logical of the inside of the eccentric jet body (1)
Chamber (3) and on the eccentric jet body (1) and positioned at the cavity (3) radial symmetric both sides at least two
Individual nozzle (4), the cavity (3) connect with the nozzle (4)；The central axis of the nozzle (4) is located at the cavity (3)
On horizontal plane where central axis；With
Two joints (2) positioned at the both ends of the eccentric jet body (1)；The joint (2) includes being located at the joint (2)
Inside central tube (5) and the bearing (6) between the joint (2) and the central tube (5), the central tube (5)
Connected with eccentric jet body (1) fixation；The bearing (6) can make the central tube (5) in the joint (2) transfer
It is dynamic；
Also, the weight of the bottom (1a) of the eccentric jet body (1) is more than the top (1b) of the eccentric jet body (1)
Weight.
2. horizontal well horizontal-jet fracturing device according to claim 1, it is characterised in that in the eccentric jet body
(1) the bottom (1a) is provided with equally distributed through hole (7), and lead is filled in the through hole (7).
3. horizontal well horizontal-jet fracturing device according to claim 1, it is characterised in that the bearing of the joint (2)
(6) thrust bearing (6a) and alignment bearing (6b) are included.
4. horizontal well horizontal-jet fracturing device according to claim 3, it is characterised in that at the thrust bearing (6a)
Outside be provided with bearing sheath (8), supporting positive cover (9), the bearing sheath are provided with the outside of the alignment bearing (6b)
(8) it is fixedly connected respectively with the joint (2) and the supporting positive cover (9).
5. horizontal well horizontal-jet fracturing device according to claim 4, it is characterised in that in the bearing sheath (8)
Fixed cover (10) is additionally provided between the central tube (5).
6. horizontal well horizontal-jet fracturing device according to claim 1, it is characterised in that in two joints (2)
One there is the first opening portion (11) for connect and open to the outside world with the central tube (5), first opening portion (11) has
There is internal thread；Another in two joints (2) has connect and open to the outside world with the central tube (5) second to open
Oral area (12), second opening portion (12) have external screw thread.
7. horizontal well horizontal-jet fracturing device according to claim 1, it is characterised in that the joint (2) it is described
It is threaded connection between central tube (5) and the eccentric jet body (1).
8. horizontal well horizontal-jet fracturing device according to claim 1, it is characterised in that also including multiple O-shaped cushion rubbers
(13)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610875906.7A CN107882543B (en) | 2016-09-30 | 2016-09-30 | Horizontal well horizontal jet fracturing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610875906.7A CN107882543B (en) | 2016-09-30 | 2016-09-30 | Horizontal well horizontal jet fracturing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107882543A true CN107882543A (en) | 2018-04-06 |
| CN107882543B CN107882543B (en) | 2020-10-09 |
Family
ID=61769254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610875906.7A Active CN107882543B (en) | 2016-09-30 | 2016-09-30 | Horizontal well horizontal jet fracturing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107882543B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083594A (en) * | 2018-08-17 | 2018-12-25 | 中煤科工集团重庆研究院有限公司 | The adjustable drilling apparatus in coal seam waterpower direction |
| CN110439526A (en) * | 2019-09-17 | 2019-11-12 | 盐城他山石液压机械有限公司 | A kind of self orientation hydraulic blast |
| CN111622721A (en) * | 2020-04-14 | 2020-09-04 | 中国石油化工股份有限公司 | Gravity direction finder and directional hydraulic jet fracturing string |
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| US7478687B2 (en) * | 2004-07-19 | 2009-01-20 | Baker Hughes Incorporated | Coiled tubing conveyed milling |
| CN201420541Y (en) * | 2009-06-04 | 2010-03-10 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Horizontal well located sand spraying and perforating device |
| CN201650247U (en) * | 2010-08-20 | 2010-11-24 | 中国石油天然气集团公司 | Hydraulic sand blast eccentric perforating gun |
| CN205532520U (en) * | 2016-04-14 | 2016-08-31 | 中国石油天然气股份有限公司 | Spray gun and spray gun group spare |
-
2016
- 2016-09-30 CN CN201610875906.7A patent/CN107882543B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7478687B2 (en) * | 2004-07-19 | 2009-01-20 | Baker Hughes Incorporated | Coiled tubing conveyed milling |
| CN201420541Y (en) * | 2009-06-04 | 2010-03-10 | 中国石油化工股份有限公司胜利油田分公司采油工艺研究院 | Horizontal well located sand spraying and perforating device |
| CN201650247U (en) * | 2010-08-20 | 2010-11-24 | 中国石油天然气集团公司 | Hydraulic sand blast eccentric perforating gun |
| CN205532520U (en) * | 2016-04-14 | 2016-08-31 | 中国石油天然气股份有限公司 | Spray gun and spray gun group spare |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109083594A (en) * | 2018-08-17 | 2018-12-25 | 中煤科工集团重庆研究院有限公司 | The adjustable drilling apparatus in coal seam waterpower direction |
| CN110439526A (en) * | 2019-09-17 | 2019-11-12 | 盐城他山石液压机械有限公司 | A kind of self orientation hydraulic blast |
| CN111622721A (en) * | 2020-04-14 | 2020-09-04 | 中国石油化工股份有限公司 | Gravity direction finder and directional hydraulic jet fracturing string |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107882543B (en) | 2020-10-09 |
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